Capital Stock (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Stockholders' Equity Note [Abstract]
Beginning balance	163,342,894	162,514,098
Public offering	4,560,000
SARs exercised	188,649	278,916
Restricted stock granted	269,506	401,122
Restricted stock units vested	240,453	119,480
Treasury shares issued	15,566	29,278
Ending balance	168,617,068	163,342,894